Brake



Aug. 27, 1935. R. A.- GoEPFRIlcl-l BRAKE Filed April 27, 1951 Fla, Z

INVENTOR RuncxYfH A. GoEPr-'RICH ATTORNEY Patented Aug. 27, 193s UNITED STATES PATENT OFFICE 'BRAKE Blgolgll@ Goepfricll, South Bend, Ind., llignot dix Brake corporation of Iliino Company, South Bend, Ind., a

Application April 27, 1931, Serial No. 533,250 l-9 Claims. (Cl. 18S-78) an internal expanding brake including a cam and.

a. cable for controlling thecam, the structure and arrangement of the cam being such that the ratio of travel of the friction 'element to the travel l of the cable is practically equal in forward andl reverse braking.

Another object of the invention is to provide an internal expanding brake having a friction element, a single anchor for the. element and means for actuating the element including a cam,

together with means associated with the cam for adjusting the over-al1 length of the element to compensate for wear.

Other objects of theinvention will appear from i the following description taken in connection with the drawing forming a part of this speciilcation, and in which:

Figure l is a vertical sectional view taken just back of the head of the drum illustrating the' side elevation and showingv friction element in the invention as applied;

Figure 2 is a vertical sectional view substantially on line 2 2, Figure l;

Figure 3 is a sectional view Substantially on line 3 3, Figure 1; and 1 Figure 4 is a sectional view substantially on line -4-4, Figure l.

Referring to the drawing for more specific details of the invention, alu represents a xed support such as a backing plate. Associated `with the backing plate is a rotatable dr-um I2 which may be secured to a wheel, not shown. Positioned on the backing plate `is a fixed anchor I4 and suitable steady rests I6 and I8.

Supported on the backing plate by the steady rests I6 and I8 is a friction element including a split band 20 having web sections 22 and 24, andl suitably secured to the band is a lining 26 adaptable for vcooperation vwith the braking surface `of the drum. The web -24 on one end of the band has' a notch 28 providing a shoulder adaptable for the reception of the anchor I4 and pivoted a fixed support 42 positioned on the bwking plate. Preferably the support 42 is provided-with circumferen'tial grooves 44 for the reception of the notched ends o1' the links, so that these arms may be retained in spaced relation.

A 'I'he web 22 on the other end of the band 2l has a slot 46 and spot-welded or otherwise secured to the opposite sides of the band are plates 48n having semi-cylindrical registering portions bridging the slot in the band to provide a sleeve l0 50 which is internally threaded to receivea screw 52.

The screw 52 is provided with a collar I4 and an elongated head 56. The head 56 extends between the links 36 and engages the anchor I4 15 by line contact. The collar on the screw engages 'arcuate edges oi' the links 36 and this collar is milled upon its periphery, as indicated at 58 so that it may be easily manipulated. By adjusting the screw 52 the friction element of vband 2l may be adjusted in proper spaced relation .to the braking surface of the drum.

In operation, force is applied to the tension member or cable 32, and this force is transmitted to the lever 30. Upon movement of the lever 36 25 the links 36 pivoted to the lever and fulcrumed on the fixed supportv 42 transmit the force through the screw 52 to the friction element. When force is applied to the friction element, the element is moved into drum engagement. o During this operation the friction element is not disengaged from the anchor, hence there is no clicking' incident to the friction element moving away from and returning to its anchor. The structure of the operative cam, the arrangement 35 `of the control cable therefor and the relation of these elements to the friction element is such lthat the ratio of travel of the friction element to the travel of the cable is practically equal in both forward and reverse braking. 40

Although this invention has been described in connection with certain specific embodiments, the principles involved are susceptible of numerous other applications that will readily occur to persons skilled in the art. The invention is, there- 45 fore, to be limited only as indicated by the scope ofthe appended claims. H

Having thus described the various features of the invention, what I claim as new and desire tosecure by Letters Patent-is:

1. A brake comprising a friction element having separable ends, an anchorage for said ends, a lever pivoted to one of the ends, a fixed support,

i. and a link pivoted to the lever and fulcrumed on the fixed support and engaging the other endot the frictionelement and transmitting the-braking torque to said anchorage from said other end.

2. A brake comprising a friction element having separable ends, a xed support between the separable ends, a lever pivoted to one end of the friction element, a link pivotally connected to the lever and fulcrunled on the support and adaptable forV engagement with the other end of the friction element, and anchorage means taking the braking torque directly from one of said ends and through said link from the other of said ends.

ing separable ends, a fixed support between the separable ends, a lever pivoted to one end of the friction element, spaced corresponding links pivoted to the lever and fulcrumed on the support and a member threaded in the other end of the anchor, a lever pivoted to one end of the 'friction element, spaced corresponding links pivotally connected to the lever and fulcrumed on the xed support and a member threaded in the other end of the friction element extending between the links and engaging the anchor.

5. A brake comprising a friction element having separable ends, an anchor between the separable ends, a xed support adjacentthe anchor, a

lever pivoted to one end of the friction element, spaced corresponding links pivotally connected Vto the lever and fulcrumed on the fixed support,

friction element extending between the links and vengaging the anchor and a collar on the threaded member engaging the 6. A brake comprising a backing plate, a rotatable drum associated therewith, an anchor on the backing plate, a xe'd support adjacent the anchor, a friction element having separable ends one of which is provided with a shoulder adapted to embrace the anchor; a lever pivoted totheshouldered end of the friction element,

corresponding links pivotally. connected to 'the lever and fulcrumed on the nxed support, a screw threaded into the` other end of the friction element and extending between-the links for en gagement with the anchor and a collar on the screw engaging the links. Y

'1. A brake comprising abacklng plate, a rotatable drum associated therewith, an anchor on the backing plate, a fixed support adjacent the anchor, a friction element on the backing plate end of the friction element adapted to embrace the anchor, a lever pivoted to the shouldered end of the friction element; spaced links pivoted to the. lever and partially encircling the anchor with thenfree ends embracing the xed support, a

screw threaded into the other end of tl friction element projecting between-the spaced links lfor .screwthelinksanldacableconnectedto'the lever. 8.. A brake comprising friction means having 'separable ends with an anchor adjacent thereto,

pivotally-connectedlapplylng mmnbers acting re` spectively on said ends and one of which is Vformed withanopening,andathrustmember adjustably mounted on one of said ends and extending through said opening and engaging the anchor. 10. A brake comprising friction means having separable ends with an anchor adjacent thereto, pivotally-connected applying members acting respectively on said ends and one of which is formed with an opening, a ixedpivot for one of said members and a movable pivot connecting the other member to one of said ends, and a thrust member engaging one of said ends and through said opening and engaging the anchor.

11. A brake having an anchor, an applying linkage having a xed fulcrum adjacent said anchor, a thrust member extending through an opening in a part of said linkage and engaging the anchor, and a collar on said thrust member operatively engaged by the linkage. l

12. A brake having an anchor, an applying linkage having a. fixed fulcrum adjacent said an- 14. An applying device comprising pivotallyconnected members' one of which has an opening, and an adjustably-extensible thrust member in said opening having a collar engaged by the member having the opening.

15. A brake comprising a backing plate and friction means carried thereby having separable ends, an anchor between said ends, and applying means on said en ds and including in gaging pivotally-movable levers moving parallel to the baclnng plate and one of which is mounted on one of said ends and which has its endmoving in the space between the friction means, together with a ltensioni member connected to said end of the and acting through said one lever to rockboth levers to apply the brake.

friction means carri ends, an anchor between said ends, and applying means acting on said ends and including interengaging pivotally-movable levers moving parel: lel to the backing plate and one of which is mountedonI one of saidends and which has its' l end moving in -the space between the plate and the friction means, together with a tension member connected to said end of the lever and acting through said onelever to rock levers to B Dply the brake. one of the being arranged to'oat with said ends of the friction means.

1'1. A brake comprising a' backing plate and friction means carried thereby having separable i ends, an anchor between said ends, and appbinll means acting on said ends and including interengaging pivotaiLv-movable levers moving parallel to the backing plate andone'orwhich is moimted on one of said ends and which has itsv endmovinginthespacebetweenthebackinl plate and the friction means, together with a tension member connected to said end of -the lever .and acting through said one lever to rock both levers to apply the brake, one of the levers beim arranged to iloatwith said e ends ofthe friction means, the other .of said being tively to the backing plate.

18. A brake comprising a backing plate and friction means carried thereby having' separable ends,` an anchor between said ends, an operating lever pivoted to oneof said ends and movable in a plane paralleling the backing plate in the space between said plate and the portion of the friction .i means adjacent said end, and a thrust device movably engaging said operating lever and extending past and engageable with said anchor and lncluding an adjustable part arranged between said 2,012,664. y rockable about an axis that remains xed re friction means carried thereby having separable ends, an anchor betweensaid ends. an operating lever pivoted to one o1' said ends, and a pivotally mounted thrust device movabiy engaging said operating lever and extending past and engageable withisaid anchor and the other of said separable ends and including an adjustable part arranged 1g between said anchor and said other end.

' RUDOLPH A. GOEPFRICH. 

